Library

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    Electronic Resource
    Electronic Resource
    Application of transmission Mössbauer spectroscopy to the surface study of Ni(II)-Fe(III) hydroxide electrocatalysts: Comparison with AES data (1993)
    Chichester [u.a.] : Wiley-Blackwell
    Surface and Interface Analysis 20 (1993), S. 949-954 
    Details
    ISSN: 0142-2421
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: Transmission Móssbauer spectra of binary coprecipitated nickel(II)-iron(III) hydroxides (molar ratios 9:1 and 4:1) are analysed and compared with the results of AES analyses of their surface composition. A correlation between the data of the above techniques has been noted, indicating a redistribution of the components (i.e. Ni and Fe) in the surface layers, the latter being enriched with iron(III) as compared to the bulk. The results obtained are in good agreement with an excellent electrocatalytic activity of composite Ni-Fe hydroxide systems towards anodic oxygen evolution in alkaline electrolytes, taking into account a distinctly exhibited ‘surface’ electrocatalytic effect of ferric species on the nickel hydroxide electrode in the anodic oxygen evolution process revealed previously. Transmission Móssbauer spectroscopy has been shown to be a highly effective probe sensitive both to various bulk and surface effects related to the solid phases studied.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/sia.740201204
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Continuum electrostatics of the C-peptide: Anatomy of the problem (1992)
    New York, NY : Wiley-Blackwell
    Proteins: Structure, Function, and Genetics 13 (1992), S. 120-131 
    Details
    ISSN: 0887-3585
    Keywords: protein folding ; α-helix ; Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine
    Notes: A computational study of the role of all ionizable groups of the C-peptide in its helix-coil transition is performed within the framework of continuum electrostatics. The method employed in our computations involves a numeric solution of the Poisson equation with the Boundary Element Method. Our calculations correctly predict the experimentally observed trends in the helix-coil equilibrium of the C-peptide, and suggest that the mechanisms involved are more complex than usually presumed in the literature. Our results suggest that electrostatic interactions in the unfolded conformation are often more important than in the helix, total electrostatic contribution to the helix-coil transition due to the side chains of the C-peptide destabilizes the helix, changes in the helix stability produced by the changes in the ionization state of the side chains are dominated by side chain effects, the effect of the helix dipole on the energetics of the helix-coil transition of the C-peptide is either minor or similar to other contributions in magnitude; while the formation of a salt bridge is electrostatically favorable, formation of the hydrogen bond between a charged and a polar side chains is not. Factors limiting the accuracy of the computations are discussed. © 1992 Wiley-Liss, Inc.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prot.340130205
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    The structure of the complex between influenza virus neuraminidase and sialic acid, the viral receptor (1992)
    New York, NY : Wiley-Blackwell
    Proteins: Structure, Function, and Genetics 14 (1992), S. 327-332 
    Details
    ISSN: 0887-3585
    Keywords: crystallographic ; neuraminidase ; influenza virus ; sialic acid ; Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine
    Notes: Crystallographic studies of neuraminidase-sialic acid complexes indicate that sialic acid is distorted on binding the enzyme. Three arginine residues on the enzyme interact with the carboxylate group of the sugar which is observed to be equatorial to the saccharide ring as a consequence of its distorted geometry. The glycosidic oxygen is positioned within hydrogen-bonding distance of Asp-151, implicating this residue in catalysis. © 1992 Wiley-Liss, Inc.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prot.340140302
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Recombinant antineuraminidase single chain antibody: Expression, characterization, and crystallization in complex with antigen (1993)
    New York, NY : Wiley-Blackwell
    Proteins: Structure, Function, and Genetics 16 (1993), S. 57-63 
    Details
    ISSN: 0887-3585
    Keywords: X-ray crystallography ; antibody domain ; recombinant DNA ; binding affinity ; antigen-antibody complex ; Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine
    Notes: The variable heavy (VH) and variable light (VL) genes of NC10, a monoclonal antibody with specificity toward N9 neuraminidase (NA), were cloned and sequenced. A single chain Fv (scFv) fragment of NC10, consisting of VH and VL domains joined by a peptide linker, was designed, constructed and expressed in the E. coli expression vector pPOW. The N-terminal secretion signal PelB directed the synthesized protein into the periplasm where it was associated with the insoluble membrane fraction. An octapeptide (FLAG) tail was fused to the C-terminus of the single chain Fv to aid in its detection and remained intact throughout the protein purification process. NC10 scFv was purified by solubilization of the E. coli membrane fraction with guanidinium hydrochloride followed by column chromatography. The purified NC10 scFv showed binding affinity for its antigen, NA, 2-fold lower than that of the parent Fab. The complex between NA and the scFv has been crystallized by the vapor diffusion method. The crystals are tetragonal, space group P4212, with unit cell dimensions a = b = 141 Å, c = 218 Å. © 1993 Wiley-Liss, Inc.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prot.340160107
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    Roughness of the globular protein surface: Analysis of high resolution X-ray data (1997)
    New York, NY : Wiley-Blackwell
    Proteins: Structure, Function, and Genetics 28 (1997), S. 194-201 
    Details
    ISSN: 0887-3585
    Keywords: accessible and molecular surfaces ; fractal and topological dimensions ; yardstick ; Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine
    Notes: In an earlier publication [Serdyuk, I.N. et al., Biofizika, in press, 1997] we demonstrated that the asymmetry extent of globular proteins does not change with increasing their sizes, and the observed nontrivial dependence of the protein accessible surface area on the molecular mass [Miller, S., J. Mol. Biol. 196:641-656, 1987] (As - M dependence) is a reflection of the protein surface relief peculiarities. To clarify these peculiarities, an analysis of the molecular surface on the basis of high-resolution x-ray data has been done for 25 globular proteins not containing prosthetic groups. The procedure was based on studying the dependence of the minimal number (N) of probe bodies (here cubes) covering the entire protein surface, both on their size (N - R dependence) and on the value of dry protein volume (N - V dependence). Two levels of protein surface organization have been detected by molecular surface analysis. On the micro scale (2-7 Å), the surface is characterized by a D = 2.1 fractal dimension which is intrinsic to surfaces with weak deformations and reflects the local atomic group packing. On the macro scale, large-scale surface defects are revealed that are interpreted as the result of secondary structure elements packing. A simple model of protein surface representation reflecting large-scale irregularities has been proposed. Proteins 28:194-201, 1997. © 1997 Wiley-Liss Inc.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
  • 6
    Electronic Resource
    Electronic Resource
    Chiral discrimination phenomena in mixed-ligand copper(II) complexes with amino acids and 1,3-dicarbonyl compounds (1993)
    New York, NY [u.a.] : Wiley-Blackwell
    Chirality 5 (1993), S. 303-309 
    Details
    ISSN: 0899-0042
    Keywords: enantioselectivity ; mixed-ligand copper complexes ; formation constants ; amino acids ; 1,3-dicarbonyl compounds ; circular dichroism ; Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Circular dichroism (CD) spectra of individual mixed-ligand copper(II) complexes of 1,3-dicarbonyl compounds, (1S)- or (1R)-3-hydroxymethylene camphor, (1S)-3-trifluoroacetyl camphor, or (1R)-2-hydroxymethylene menthone, and α-amino acids, alanine, valine, proline, or their N-alkyl derivatives, were calculated from CD spectra of equilibrium solutions containing the above constituents in methanol or ethylene dichloride. Diastereomeric mixed-ligand complexes incorporating identical dicarbonyl but enantiomeric N-alkyl-α-amino acid ligands exhibit quasi-enantiomeric CD spectra. Unsubstituted amino acids, on the contrary, will make no decisive contributions to the net optical activity spectrum of the mixed-ligand complexes. Formation constants of diastereomeric mixed-ligand complexes have been calculated from data on disproportionation of the latter into corresponding equally paired complexes. Enantioselectivity was demonstrated to amount to up to 700 cal/mol. Possible steric structures of mixed-ligand complexes are discussed. © 1993 Wiley-Liss, Inc.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/chir.530050505
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 7
    Electronic Resource
    Electronic Resource
    Phosphorylated imidazo[1,2-a]pyridinesC-Phosphorylated Azoles. I. (1995)
    New York, NY [u.a.] : Wiley-Blackwell
    Heteroatom Chemistry 6 (1995), S. 419-432 
    Details
    ISSN: 1042-7163
    Keywords: Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The reaction of phosphorus(III) halides with imidazo[1,2-a]pyridines in the presence of bases leads to the formation of 3-phosphorylated imidazo[1,2-a]pyridines. The reaction proceeds in high yield and requires no catalysts.In the compounds obtained, in contrast to phosphorylated indolizines, the phosphorus-heterocycle bond is stable and not cleaved by dry hydrogen chloride, alcohols, or water.Imidazo[1,2-a]pyridines with the phosphinic and phosphinous groups can be alkylated both at the phosphorus and at the nitrogen atom of the heterocycle, the alkylation direction being dependent on the strength of the alkylation reagent used. © 1995 John Wiley & Sons, Inc.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hc.520060507
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 8
    Electronic Resource
    Electronic Resource
    1,1,3,3,3-Pentafluoro-2-pentafluorophenylpropene oxide. Precursor for novel phosphonates and ylides (1997)
    New York, NY [u.a.] : Wiley-Blackwell
    Heteroatom Chemistry 8 (1997), S. 59-61 
    Details
    ISSN: 1042-7163
    Keywords: Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 1,1,3,3,3-Pentafluoro-2-pentafluorophenylpropene oxide reacted with triethyl phosphite to give the ylide C6F5(CF3)C=P(OEt)3. Hydrolysis yielded the phosphonate C6F5(CF3)CHP(O)(OEt)2, which was dehydrofluorinated using Et3N · BF3 to form the vinyl phosphonate C6F5(CF2=)CP(O)(OEt)2, a compound available also directly from the starting epoxide and diethyl trimethylsilyl phosphite. The vinyl phosphonate and diethyl trimethylsilyl phosphite furnished a 2:1 mixture of (Z) and (E) bisphosphonates together with fluorotrimethylsilane. Thermolylsis of the ylide gave diethyl phosphorofluoridate and 1,1-difluoro-2-pentafluorophenyl-but-1-ene. © 1997 John Wiley & Sons, Inc.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
  • 9
    Electronic Resource
    Electronic Resource
    1,1,1,4,5,5,5-Heptafluoro-4-(trifluoromethyl)-2,3-pentanedione, a potent reagent for the synthesis of cyclic λ5σ5 phosphoranesDedicated to Prof. William E. McEwen on the occasion of his seventy-fifth birthday. (1998)
    New York, NY [u.a.] : Wiley-Blackwell
    Heteroatom Chemistry 9 (1998), S. 109-113 
    Details
    ISSN: 1042-7163
    Keywords: Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 1,1,1,4,5,5,5-Heptafluoro-4-(trifluoromethyl)-2,3-pentanedione reacted with λ3σ3-phosphorus compounds, PR1R2R3 (R1 = CF3, R2 = R3 = Me, iPr, NEt2; R1 = NCO, R2 = R3 = OMe, OEt, R2-R3 = OCH2CH2O, OCMe2CMe2O; R1 = OSiMe3, R2 = R3 = OEt; R1 = NEt2, R2 = R3 = OCH2CF3; R1 = R2 = Et2N, R3 = OCH2CF3, OCH(CF3)2, OCH2Ph, OC6F5) to give new 1,3,2λ5σ5-dioxaphospholenes. The first λ5σ5 phosphoranes with an OCN group bonded to phosphorus were obtained. © 1998 John Wiley & Sons, Inc. Heteroatom Chem 9:109-113, 1998
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
  • 10
    Electronic Resource
    Electronic Resource
    Polymerization of conjugated dienes initiated by soluble organosodium compounds in hydrocarbon solventsPresented at ‘MacroAkron '94, 35th IUPAC Symposium on Macromolecules’, Akron, Ohio, 11-15 July 1994. (1995)
    New York, NY [u.a.] : Wiley-Blackwell
    Polymer International 37 (1995), S. 165-169 
    Details
    ISSN: 0959-8103
    Keywords: anionic polymerization ; chain transfer ; organosodium initiators ; kinetics ; butadiene ; isoprene ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Polymerization of butadiene and isoprene in hydrocarbon solvents initiated by unsolvated organosodium compounds was studied. It was found that the polymer molecular weight and the MWD are determined mainly by chain transfer to solvent and polymer, and no chain transfer to monomer was observed even in the case of isoprene. The overall polymerization rate is proportional to the concentrations of the monomer and the initiator. Apparent chain propagation rate constants were found to be 0.11 litre mol-1 s-1 for butadiene and 0.065 litre mol-1 s-1 for isoprene polymerization in heptane at 30°C. It is suggested that associated (dimeric) forms of polydienylsodium active centres play an important role in chain propagation, being responsible for a stronger chain transfer and a greater 1,2-butadiene, or 3,4-isoprene, unit content than in polymerization with other alkali metals.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pi.1995.210370303
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...